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[Qemu-devel] x86: PMTIMER calibration sometimes fails
From: |
Thomas De Schampheleire |
Subject: |
[Qemu-devel] x86: PMTIMER calibration sometimes fails |
Date: |
Tue, 21 Sep 2010 08:58:12 +0200 |
Hi,
I am running an x86 based Linux system under qemu. Linux boots up
correctly in most cases, however sometimes the PMTIMER fails to
calibrate correctly:
[ 0.000000] Fast TSC calibration failed
[ 0.000000] TSC: Unable to calibrate against PIT
[ 0.000000] TSC: HPET/PMTIMER calibration failed.
[ 0.000000] Marking TSC unstable due to could not calculate TSC khz
[ 0.010998] Calibrating delay loop... 1011.71 BogoMIPS (lpj=505856)
while the following messages appears in a good situation:
[ 0.000000] Fast TSC calibration failed
[ 0.000000] TSC: Unable to calibrate against PIT
[ 0.000000] TSC: using PMTIMER reference calibration
[ 0.000000] Detected 2258.151 MHz processor.
[ 0.009099] Calibrating delay loop (skipped), value calculated
using timer frequency.. 4516.30 BogoMIPS (lpj=2258151)
HPET is deliberately disabled.
Both situations occur with the same Linux kernel configuration, so I
am assuming this is a qemu problem.
I have the impression that in a bad situation, the boot messages
scroll by slower, indicating a slower emulation than in the good case
(as the timings seen by the kernel are approximately the same).
Please find in attachment the full boot log of a good and bad
situation, plus the kernel configuration.
Have you seen this problem before? Do you have any idea how to fix it?
Thanks,
Thomas
bootmsg-good
Description: Binary data
bootmsg-bad
Description: Binary data
.config
Description: Binary data
- [Qemu-devel] x86: PMTIMER calibration sometimes fails,
Thomas De Schampheleire <=